Classification
330 - Economics
361 - Social problems & social welfare in general
363 - Other social problems & services
2
380 - Commerce, communications & transportation
658 - General management
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
320 - Political science
1
333 - Economics of land & energy
1
336 - Public finance
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
600 - Technology
1
610 - Medicine & health
1
612 - Human physiology
1
800 - Literature & rhetoric
1